Method for Artifact-Free Rendering of Metal Parts in Three-Dimensionally Reconstructed Images

1. A method for artifact-free rendering of metal parts in three-dimensionally reconstructed images of an examination object in a patient, the method comprising the following steps: S 1 ) recording a 3D scan without metal parts for producing a 3D data record; S 2 ) recording a number n of projection images with metal parts from different known locations or directions, the number n of projection images being selected as a value from two to ten; S 3 ) 2D/3D registering of bone in the n projection images with the 3D data record; S 4 ) 2D/3D registering 3D models of the metal parts to metal parts in the n projection images; S 5 ) calculating locations of the metal parts in the 3D data record on the basis of the 2D/3D registration thereof; and S 6 ) superposing all current locations of the metal parts in the 3D data record.

2. The method according to claim 1 , which further comprises carrying out the recording of the 3D scan without metal parts as a presurgical computed tomography (CT) scan, a presurgical magnetic resonance imaging (MRI) scan or an intrasurgical C-arm scan.

3. The method according to claim 1 , which further comprises producing the 3D data record presurgery and producing the n projection images during surgery.

4. The method according to claim 1 , wherein the metal parts are screws.

5. The method according to claim 1 , wherein the metal parts are pedicle screws.

6. The method according to claim 1 , which further comprises bringing about the superposition of all current locations of the metal parts according to method step S 6 ) by superposition of the 3D models.

7. A method for artifact-free rendering of metal parts in three-dimensionally reconstructed images of an examination object in a patient, the method comprising the following steps: S 1 ) recording a 3D scan without metal parts for producing a 3D data record; S 2 ) recording a number n of projection images with metal parts from different known locations or directions, the number n of projection images being selected as a value of from four to six; S 3 ) 2D/3D registering of bone in the n projection images with the 3D data record; S 4 ) 2D/3D registering 3D models of the metal parts to metal parts in the n projection images; S 5 ) calculating locations of the metal parts in the 3D data record on the basis of the 2D/3D registration thereof; and S 6 ) superposing all current locations of the metal parts in the 3D data record.